Hua Hu

Dr. Hua Hu

orcid

Research Focus & Metrics

Academic Career Length

22Years (2005-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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14 March 2022 in Sustainability
Verified
Journal Article
Open access
PDF file
YFYong Fang
Yong Fang
ZJZhou Jiayi
Zhou Jiayi
HHHua Hu
Hua Hu
YHYanxi Hao
Yanxi Hao
DXDianliang Xiao
Dianliang Xiao
SLShaojie Li
Shaojie Li
To determine a better combination of signs and markings on expressway tunnel entrance sections, three types of typical signs and markings were compared and tested according to five indicators: speed, lane lateral offset, lane change behavior, fixation behavior, and operating load, using a driving simulator. The results identified that the obvious no overtaking and speed limit signs, combined with a layer of thin red pavement, had the most influence on drivers’ speed, and they led to the highest fixation frequency of static facilities, the longest average distance from the completion point of the lane change to the entrance, and the longest average lane change distance, which could help drivers to pass through tunnel entrance sections more smoothly. The location of the static facilities should be between 3 s before the tunnel entrance and 3 s after entering the tunnel, as this is the area where a driver’s relative viewpoint changes. The improper combination of warning signs and deceleration measures will affect a driver’s judgment, causing negative effects, such as premature lane changes and an increased operating load. The research results can provide a design basis and reference for the combination setting of safety signs and markings on tunnel entrance sections.

21 October 2019 in Concurrency and Computation: Practice and Experience
Verified
Journal Article
Closed access
PDF file
XDXiaobing Ding
Xiaobing Ding
YZYuan Zhao
Yuan Zhao
ZLZhigang Liu
Zhigang Liu
HHHua Hu
Hua Hu

1 January 2005 in Acta Physica Sinica
Verified
Journal Article
Open access
PDF file
XJXiao Jia-Xi
Xiao Jia-Xi
QGQi Guo-Sheng
Qi Guo-Sheng
HHHua Hu
Hua Hu
XDXu Duan-Yi
Xu Duan-Yi
清华清华大学精密仪器与机械学系光盘国家工程研究中心,北京100084
清华大学精密仪器与机械学系光盘国家工程研究中心,北京100084
运用矢量衍射理论的计算方法(耦合波方法,时域有限差分法),对两种多阶光存储方案(坑深调制,坑形调制)进行了原理性分析,并简略分析了利用相变材料的幅值调制实现多阶存储的原理.由此得出多阶光存储技术的实现是利用了光与物质之间的相互作用,使光对记录介质产生作用,同时介质也对光的某些特性进行调制,而这些特征的改变一般都不止两个状态0或1,用数字方式将这多个状态记录下来便实现了多阶数字存储.此外,还提出了多阶光盘前端信号处理系统的设计与开发.该系统是多阶光存储实验系统的重要组成部分,可输出RF,TE,FE等伺服与误差信号,并将信号反馈给多阶处理芯片;同时系统还可对光学头的激光读写功率及写入时间进行控制,并能使其实现自动调焦和道跟踪.

5 January 2009
Verified
Conference Paper
Closed access
HHHua Hu
Hua Hu
XYXiaoguang Yang
Xiaoguang Yang
JTJing Teng
Jing Teng
YGYunfeng Gao
Yunfeng Gao
XZXuemei Zhou
Xuemei Zhou
In this research, a multi-modal transit network will be integrated with a nested logit (NL) approach to study the effects of integrated multi-modal transit information service (IMTIS) on residents' travel mode choice behaviors. A traffic hyper-network is designed to analyze the reason why IMTIS is helpful to promote modal shift, and a bi-level NL model is developed to deal with the complicated mode choice decisions in the multi-modal network. Considering the variation of travel time under mixed traffic conditions in China's urban traffic network, a travel time reliability factor is introduced to correct values of vital attribute variables of modes. Finally, the NL model is calibrated using data from a RP survey and usages of various travel modes with and without IMTIS. The result shows that IMTIS is effective in improving share ratios of public transport in China's big cities.

YFYong Fang
Yong Fang
ZWZhang Wenli
Zhang Wenli
HHHua Hu
Hua Hu
ZJZhou Jiayi
Zhou Jiayi
DXDianliang Xiao
Dianliang Xiao
SLShaojie Li
Shaojie Li
The aim of this study was to meet the visual cognition needs of the elderly population for the guidance marks and safety guidance marks of the rail transit connection system. Based on the visual characteristics of the elderly population, this paper firstly determined the visual field and sight range of the marks of the elderly population from three aspects—visual angle, visual distance, and height of the elderly population—and constructed the visual recognition space of the elderly population. Then, from the perspective of the setting position, the setting height, and the deflection angle, an adaptive aging safety design method for the guidance marks in the rail transit connection system is proposed. Then, based on the eye movement data of fixation duration, initial fixation duration, and the number of visits, a visual behavior index model is constructed to iteratively optimize the adaptive aging safety design of guidance marks in a rail transit connection system. A radar map is used to calculate the comprehensive index of visual behavior to determine the optimal scheme. Finally, taking the traffic connection system of Shanghai Songjiang University Town Station as an example, the eye movement data of 37 participants were collected, according to the principle that each connection path should only be taken once per person; the above method was used to design 7 connection path guidance marks for an adaptive aging safety design. The results showed that the comprehensive index of visual behavior of different paths had different degrees of improvement of up to 14.00%, which verified the effectiveness of the design method. The research results have certain theoretical significance and application value for the adaptive aging safety design and retrofit of guidance marks of rail transit connection systems.

2 April 2022 in Transportation Research Record: Journal of the Transportation Research Board
Verified
Journal Article
Closed access
HPHanchuan Pan
Hanchuan Pan
YLYue Liu
Yue Liu
ZLZhigang Liu
Zhigang Liu
HHHua Hu
Hua Hu
Taking both the total passenger waiting time and operational cost into consideration, this paper presents a mixed integer programming model to optimize a coordinated passenger inflow control strategy with collaborative train timetable for a rail corridor. A model predictive control method is developed to solve the problem of interest efficiently. Case studies validate the effectiveness of the proposed model for decreased passenger waiting time, safety risks, and system costs. Sensitivity analyses with respect to the values of time and operational cost are conducted for better application of the proposed model.